Bring a pot of water and 2 tablespoons of vinegar to a full boil. Once boiling reduce the heat so the water is simmering. Use a spoon to swirl the water into a whirlpool.
Break an egg carefully into a bowl or saucer. Slowly tip the egg into the centre. Cook for 3-4 minutes or until the white is set. Lift the egg out with a slotted spoon and drain it on kitchen paper.
Meanwhile toast the bread.
Cut the avocado in half and remove the stone. Mash the avocado and lemon juice. season well with salt and pepper.
Spread the avocado mix onto each slice of toast and top each with a poached egg. Sprinkle with fresh herbs.